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Fair Value Information - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets        
Total cash and cash equivalents $ 456,238 $ 144,377 $ 382,441 $ 121,633
Interest-earning balances due from depository institutions 10,100 17,952    
FHLB stock 17,688 17,688    
Investment securities available-for-sale 1,941,592 2,080,985    
Investment securities held-to-maturity 798,284 829,890    
Total loans, net of allowance for loan losses 4,735,048 4,771,046    
Deposits:        
Noninterest-bearing 4,062,691 3,846,436    
Interest-bearing 2,646,744 2,700,417    
Junior subordinated debentures 25,774 25,774    
Swaps 488,922 556,984    
Carrying Value [Member]        
Assets        
Total cash and cash equivalents 456,238 144,377    
Interest-earning balances due from depository institutions 10,100 17,952    
FHLB stock 17,688 17,688    
Investment securities available-for-sale 1,941,592 2,080,985    
Investment securities held-to-maturity 798,284 829,890    
Total loans, net of allowance for loan losses 4,735,048 4,771,046    
Swaps 1,645 3,211    
Deposits:        
Noninterest-bearing 4,062,691 3,846,436    
Interest-bearing 2,646,744 2,700,417    
Borrowings 487,277 553,773    
Junior subordinated debentures 25,774 25,774    
Swaps 1,645 3,211    
Estimated Fair Value [Member]        
Assets        
Total cash and cash equivalents 456,238 144,377    
Interest-earning balances due from depository institutions 10,095 17,951    
FHLB stock 17,688 17,688    
Investment securities available-for-sale 1,941,592 2,080,985    
Investment securities held-to-maturity 776,130 819,215    
Total loans, net of allowance for loan losses 4,555,459 4,678,402    
Swaps 1,645 3,211    
Deposits:        
Noninterest-bearing 4,062,691 3,846,436    
Interest-bearing 2,643,627 2,697,781    
Borrowings 486,924 553,416    
Junior subordinated debentures 19,909 18,070    
Swaps 1,645 3,211    
Estimated Fair Value [Member] | Level 1 [Member]        
Assets        
Total cash and cash equivalents 456,238 144,377    
Interest-earning balances due from depository institutions 0 0    
FHLB stock 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 0 0    
Total loans, net of allowance for loan losses 0 0    
Swaps 0 0    
Deposits:        
Noninterest-bearing 4,062,691 3,846,436    
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 0 0    
Swaps 0 0    
Estimated Fair Value [Member] | Level 2 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 10,095 17,951    
FHLB stock 17,688 17,688    
Investment securities available-for-sale 1,941,592 2,080,985    
Investment securities held-to-maturity 776,130 819,215    
Total loans, net of allowance for loan losses 0 0    
Swaps 1,645 3,211    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 2,643,627 2,697,781    
Borrowings 486,924 553,416    
Junior subordinated debentures 0 0    
Swaps 1,645 3,211    
Estimated Fair Value [Member] | Level 3 [Member]        
Assets        
Total cash and cash equivalents 0 0    
Interest-earning balances due from depository institutions 0 0    
FHLB stock 0 0    
Investment securities available-for-sale 0 0    
Investment securities held-to-maturity 0 0    
Total loans, net of allowance for loan losses 4,555,459 4,678,402    
Swaps 0 0    
Deposits:        
Noninterest-bearing 0 0    
Interest-bearing 0 0    
Borrowings 0 0    
Junior subordinated debentures 19,909 18,070    
Swaps $ 0 $ 0